Preparation of fibrous material



July 2, 1935. E. oLssoN PREPARATION OF FIBROUS MATERIAL Filed Nov. 6, 1933 INVENTOR E/I'sf 0/6290 Wk v ATTORNEY Patented July 2, 1935 t I I UNITED STATES PATENT'TOFFICEKJ Ens West Point, Va 696,7

Application November 6, 1933, Serial No.

5 Claims. (01. 92- 6) v This invention relates to the preparation of In the particular form of apparatus illustrated fibrous material for use in making paper prod in the drawing there is shown diagrammatically ucts such as paper webs or sheets, cardboard or in Fig; 1 a digester D having an inlet opening like products. p i which is connected to a source of high pres- Pulp is usually digested by low pressure steam sure steam and a charging opening lithrough 5 and suitable treating liquor and is then discharged which the fibrous material to be digested is refrom the digester, washed and ground to the deceived. The digester also has a discharge opensired fineness. These operations require a coning i2 which is connected by a conduit l3 to a siderable amount of time. plate I i which forms a support. orone of a pair This invention has for its salient object to of grinding plates I5. -The otherplate I6 is sup- 10 provide apparatus for treating fibrous material ported by a supporting plate il in a position so constructed and arranged that the time reabove the plate IS. The plate support I! is carquired for the treatment will be materially reried by a shaft i8 having thrust supporting bearduced. ings I9 and extending upwardly through the 5 Another object of the invention is to provide thrust bearings to drive transmitting mechanism an apparatus, of the. character described so conwhich is connected to a motor M by a shaft structed and arranged that high pressure used 2|. The upper-grinding plate i6 is thus posiin the digester can be utilized to force the matively driven by the motor and the lower plate terial through the grinder or pulverizer. is shown as stationary, .although if desired this 20 A further object of the invention is to proplate may alsobe rotated but in'adirection oppo- 20 vide a process of treating fibrous material so site to the direction of rotation of the plate i6.

Wo t that t e pressure from the digester The plate l5 has a central opening through. is utilized to force the material through the grindwhich the material is fed and the upper plate i6 8 ch smhas a central dome 28. The plates are prefer- 25 Further Objects o the invention will app ar. ably spaced slightly apart, the amount of spacing. 25

from the following specification taken in conbeing determined by a vertical adjustment of the nection with the drawing which forms a part of upper plate. this application, and in which The grinding plates may be of any suitable con- F 15 a diag am aticelevational view showstruction but are preferably serrated or roughing apparatus constructed in accordance with d, as showninFig, 3. 30

the invention; The grinding mechanism is housed in a casing Fig. 2 is an enlarged detail sectional elevation 30 d battle plates 3| and 32 are disposed on- Showing the grinding mechanism; opposite sides of the grinding mechanism. The

3 a t p p View Of One Of the grinding platesupport I4 is mounted on a bracket 33 car- 35 p ates; and ried by a frame member 34. A vent pipe 35 ex- 35 Fig. 4 is a rragmentary'edge vi w f a p rt tends upwardly from the casing or tank 30 to 01 ne ft grindingpletesrelieve-the pressure in the tank or casing.

Th inven i bri y described comprises a .The casing 30 has an outlet opening 36- at the digestei i which high Pressure Steam i bottom thereof which is connected byaconduit 31. tmduced n having a discharge Outlet through to a difluser or washing mechanism 38 having a 40 hic he digested material and liquor r discharge opening 39 and an outlet conduit 40 h r or bl wnf w n h digesting Operati n through which thelliquid can escape from the has been completed, I The discharge outlet of the m I digester is connected by aconduit to the grinding V I 1. apparatus, the digested material being conducted y 1 through the conduit by the force of the high presv ft t digester ha been charged and. the I sure in the dlsester a ei forced between the material therein has been treated under high d g .elements- The digeete! Operation is pressure for a relatively short time the discharge very mat iall shortened y the e of e high outlet i2 is opened permitting the treated ma- Operation pressure steam and the use of this steam to force tel-19,1 to be forced under the high pressure. in the 50 the t a through the G d meehnniem digester through the conduitiilv to the grinding further reduces the time required for carrying out mechanism and outwardly b twe n th grinding the treatment or the fibrous material. plates I 5 and i8. By these plates the material is L Fur h r e i f th v n on wi l pp -8round or pulverized-to the desired extent and from the following description. k passes through the outlet opening" or the cas- 6 pressed in the following claims.

What I claim is:

1. Apparatus for treating fibrous material comprising a digester, means for supplying high pressure steam thereto, said digester having a discharge outlet, a pulp receiving chamber, a grinder mounted in said chamber and comprising a pair of elements arranged to coact and grind the material, a conduit arranged to conduct the material from the digester outlet after the material is digested to a position between said elements, the material being forced through said conduit and between said elements by the pressure in the digester when the discharge outlet is opened, and means for rotating one of said grinding elements.

2. Apparatus for treating fibrous material com.- prising a digester, means for supplying high pressure steam thereto, said digester having a discharge outlet, a pulp receiving chamber, a grinder mounted in said chamber and comprising a pair of grinding plates, arranged to .coact and grind the material, aconduit arranged to conduct the material from the digester outlet after the material is digested to a position between the'central portions of said plates, the material being forced through said conduit and outwardly between said plates by the pressure in the digester when the discharge outlet is opened, and means for rotating one of said grinding plates.

3. Apparatus for treating fibrous material comprising a digester, means for supplying high pressure steam thereto, said digester having a discharge outlet, a pulp receiving chamber, a grinder mounted in said chamber and comprising a pair of spaced elements disposed above the level of the discharge outlet and arranged to coact and grind the material, a conduit arranged to conduct the material from the digester outlet after the material is digested to aposition between sald elements, the material being forced through said conduit and between said elements by the pressure in the digester when the discharge outlet is opened, and means for rotating one of said grinding elements.

4. Apparatus for treating fibrous material comprising a digester having a discharge outlet, means for supplying high pressure steam thereto, a pulp chamber, a pair of grinding plates therein, one plate having an opening for receiving the material to be ground, a conduit forconducting the treated material from the digester outlet after the material is digested to said opening, the pressure in the digester forcing the material through said conduit to the grinding plates, and means for rotating one of said plates.

. 5. The process of treating fibrous material which consists of completely digesting the material under high pressure and utilizing the digester pressure to force the material to and through grinding mechanism when the digested charge 7 is blown from the digester.

' ELIS OLSSON. 

